MERCEDES-BENZ CLS COUPE 2012 Owners Manual

Display messages Possible causes/consequences and
M Solutions
Â
Remove starting
button
,then insert key The KEYLESS-GO ke
yisnot continually detected.
KEYLESS-GO is temporaril ymalfunctioning or is defective. Awarn-
ing tone also sounds.
X Inser tthe keyintot he ignition loc kand tur nittot hedesired
position.
X Visi taq ualified specialist workshop. Â
Close doors to
lock vehicle At least one door is open.
Awarning tone also sounds.
X Close all door sand loc kthe vehicle again. Warning and indicator lamps in the
instrument cluster
Warning and indicator lamps over-
view
L Dipped-beam headlamps
(Ypage 111)
T Side lamps (Y page 112)
K Main-beam headlamps
(Ypage 113)
#! Turn signals (Y page 113)
R Rear foglamp (Y page 112)
ü Seat belts (Y page 259)
J Brakes (Ypage 260)
! ABS (Ypage 261)
÷ ESP®
(Y page 263)
å ESP®
OFF (Y page 263)
M SPORT handling mode in AMG
vehicles (Ypage 264)
6 SRS (Ypage 266)
; Enginediagnostics
(Y page 266)
8 Reserve fuel (Y page 267)
? Coolant (Ypage 267)
· Distancewarning signal
(Y page 269) %
Diesel engine: preglow
(Ypage 143)
h Tyre pressure monitor
(Ypage 270) 258
Warning and indicator lampsint
he instrument clusterOn-board computer and displays

Safety
Seat belts Problem Possible causes/consequences and
M Solutions
ü
Only for certain coun-
tries: the red seat belt
warning lamp lights up
for six seconds after
the engine starts.
The seat belt warning lamp reminds the driver and front passenger
to fasten their seat belts.
X
Fasten your seat belt (Y page 49).ü
Only for certain coun-
tries: the red seat belt
warning lamp lights up
after the engine starts.
In addition,
awarning
tone sounds for up to
six seconds. The driver's seat belt is not fastened.
X
Fasten your seat belt (Y page 49).
The warning tone ceases. ü
The red seat belt warn-
ing lamp lights up after
the engine starts, as
soon as the driver's or
the front-passenger
door is closed.
The driver or front passenger has not fastened their seat belt.
X
Fasten your seat belt (Y page 49).
The warning lamp goes out. There are objectsont
he front-passenger seat.
X Remove the objectsf rom the front-passenger seat and stow
them in asecure place.
The warning lamp goes out. ü
The red seat belt warn-
ing lamp flashes and an
intermittenta
udible
warning sounds. The driver or passenger has no
tfastened their seat belt .Atthe
same time, the car is being driven faster than 25 km/h or has been
briefly driven faster than 25 km/h.
X Fasten your seat belt (Y page 49).
The warning lamp goes out and the intermittent warning tone
ceases. There are objectsont
he front-passenger seat. At the same time,
you are driving faster than 25 km/h or have briefly driven faster
than 25 km/h.
X Remove the objectsf rom the front-passenger seat and stow
them in asecure place.
The warning lamp goes out and the intermittent warning tone
ceases. Warning and indicator lampsint
he instrument cluster
259On-board computer and displays Z

Safety systems
Problem Possible causes/consequences and
M Solutions
J
The yellow brake sys-
tem warning lamp
lights up while the
engine is running.
G
WARNING
The brake system is malfunctioning and the braking characteris-
tics may be affected.
There is arisk of an accident.
X If the multifunction display shows adisplay message, please
observe this.
X Drive on carefully.
X Visit aqualified specialist workshop. J
The red brake system
warning lamp comes on
while the engine is run-
ning.
Awarning tone
also sounds. G
WARNING
The brake boosting effect is malfunctioning and the braking char-
acteristic smay be affected.
There is arisk of an accident.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X Secure the vehicle against rolling away (Y page 159).
X Consult aqualified specialist workshop.
X Observe the additional display messages in the multifunction
display. J
The red brake system
warning lamp comes on
while the engine is run-
ning.
Awarning tone
also sounds. There is insufficient brake fluid in the brake fluid reservoir.
G WARNING
The braking efficienc ymay be impaired.
There is arisk of an accident.
X Pull over and stop the vehicle safely as soon as possible, paying
attention to road and traffic conditions. Do not continue driving
under any circumstances.
X Secure the vehicle against rolling away (Y page 159).
X Do not top up the brake fluid. Topping up will not rectify the
fault.
X Consult aqualified specialist workshop.
X Observe the additional display messages in the multifunction
display. 260
Warning and indicator lampsint
he instrument clusterOn-board computer and displays

Problem Possible causes/consequences and
M Solutions
!
The yellowA
BS warning
lamp is lit while the
engine is running. ABS (Anti-lock Brake System) has been deactivated due to
afault.
For this reason, BAS (Brake Assist), BAS PLUS, ESP ®
(Electronic
Stability Program), PRE-SAFE ®
,P RE-SAFE ®
Brake ,the HOLD func-
tion, hill start assist and the adaptive brake lights are also deac-
tivated, for example.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to function normally, but without the
functions listed above. The wheels could therefore lock if you
brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an accident increases.
X Observe the additional displaym essages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop.
If the ABS control unit is faulty, there is also apossibility that other
systems, such as the navigation system or the automatic trans-
mission, will not be available. Warning and indicator lampsint
he instrument cluster
261On-board computer and displays Z

Problem Possible causes/consequences and
M Solutions
!
The yellowA
BS warning
lamp is lit while the
engine is running. ABS is temporarily unavailable. Therefore, BAS,B
AS PLUS, ESP®
,
EBD (electronic brake force distribution), PRE-SAFE ®
,
PRE-SAFE ®
Brake, the HOLD function, hill start assist and the
adaptive brake lights, for example, are also deactivated.
Possible causes:
R Self-diagnosis is not yet complete.
R the on-board voltage may be insufficient.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to function normally, but without the
functions listed above. The front and rear wheels could therefore
lock if you brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
There is arisk of an accident.
X Carefullyd rive onasuitable stretch of road, making slight steer-
ing movements, at aspeed above 20 km/h.
The functions mentioned above are available again when the
warning lamp goes out.
If the warning lamp is still on:
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop. 262
Warning and indicator lampsint
he instrument clusterOn-board computer and displays

Problem Possible causes/consequences and
M Solutions
!
The yellowA
BS warning
lamp is lit while the
engine is running. A
warning tone also
sounds. EBD is not available due to
amalfunction .Therefore, ABS,B AS,
BAS PLUS, ESP ®
,P RE-SAFE ®
,P RE-SAFE ®
Brake, the HOLD func-
tion, hill start assist and the adaptive brake lights, for example,
are not available either.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to function normally, but without the
functions listed above. The front and rear wheels could therefore
lock if you brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an accident increases.
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop. J֌!
The red brake warning
lamp, the yellow ESP
®
and ESP ®
OFF warning
lamps and the yellow
ABS warning lamp are
lit while the engine is
running. ABS and ESP
®
are not available due to afault. Therefore, BAS,B AS
PLUS, EBD,P RE-SAFE®
,P RE-SAFE ®
Brake ,the HOLD function ,hill
start assist and th eadaptive brak elights ,for example, are not
available either.
ATTENTION ASSIST is deactivated.
G WARNING
The brak esystem continues to function normally, but without the
function slisted above. The fron tand rea rwheels could therefore
lock if you brake hard, for example.
The steerability and braking characteristics may be severely affec-
ted. The braking distance in an emergency braking situation can
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an accident increases.
X Observe the additional displaym essages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop. Warning and indicator lampsint
he instrument cluster
263On-board computer and displays Z

Problem Possible causes/consequences and
M Solutions
÷
The yellowE
SP®
warn-
ing lamp flashes while
the vehicle is in motion. ESP
®
or traction control has intervened because there is arisk of
skidding or at least one wheel has started to spin.
Cruise control or DISTRONIC PLUS is deactivated.
X Only depress the accelerator pedal as far as necessary when
pulling away.
X Accelerate more gently while the vehicle is in motion.
X Adapt your driving style to suit the road and weather conditions.
X Do not deactivate ESP ®
.
For exceptions, see: (Y page 65).å
The yellowE
SP®
OFF
warning lamp is lit while
the engine is running. ESP
®
is deactivated.
G WARNING
If ESP ®
is switched off, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an accident increases.
X Reactivate ESP ®
.
For exceptions, see: (Y page 65).
X Adapt your driving style to suit the road and weather conditions.
If ESP ®
cannot be activated:
X Drive on carefully.
X Have ESP ®
checked at aqualified specialist workshop. M
AMG vehicles only:
The yellow SPORT han-
dling mode warning
lamp is lit while the
engine is running.
SPORT handling mode is activated.
G WARNING
When SPORT handling mode is switched on, ESP ®
is unable to
stabilise the vehicle.
The danger of skidding and having an accident increases.
X Only switch to SPORT handling mode in accordance with the
condition swritten in the "Activating/deactivating SPORT han-
dling mode" section (Y page 66).264
Warning and indicator lampsint
he instrument clusterOn-board computer and displays

Problem Possible causes/consequences and
M Solutions
֌
The yellowE
SP®
and
ESP ®
OFF warning
lamps are lit while the
engine is running. ESP
®
,B AS,B AS PLUS, PRE-SAFE ®
,P RE-SAFE ®
Brake, the HOLD
function, hill start assist and the adaptive brake lights are not
available due to amalfunction.
ATTENTION ASSIST is deactivated.
G WARNING
The brake system continues to function normally, but without the
functions listed above.
The braking distance in an emergency braking situation can thus
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an accident increases.
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop. ֌
The yellowE
SP®
and
ESP ®
OFF warning
lamps are lit while the
engine is running. ESP
®
,B AS, PRE-SAFE ®
,t he HOLD functio nand hill start assist are
temporaril yunavailable.
The adaptive brake lights ,BAS PLU Sand PRE-SAFE ®
Brake may
also have failed.
ATTENTIO NASSIST is deactivated.
Self-diagnosi sisnot yetcomplete.
G WARNING
The brake system continues to function normally, but without the
functions listed above.
The braking distance in an emergenc ybraking situation can thus
increase.
If ESP ®
is not operational, ESP ®
is unable to stabilise the vehicle.
The danger of skidding and having an accident increases.
X Carefully drive on asuitable stretch of road, making slight steer-
ing movements at aspeed above 20 km/h.
The functions mentioned above are available again when the
warning lamp goes out.
If the warning lamp is still on:
X Observe the additional display messages in the multifunction
display.
X Drive on carefully.
X Visit aqualified specialist workshop. Warning and indicator lampsint
he instrument cluster
265On-board computer and displays Z

Problem Possible causes/consequences and
M Solutions
J
The red brake system
warning lamp comes on
while the vehicle is
moving.
Awarning tone
also sounds. You are driving with the parking brake applied.
X
Release the parking brake.
The warning lamp goes out and the warning tone ceases. 6
The red SRS warning
lamp is lit while the
engine is running.
There is
amalfunction in the SRS (Supplemental Restraint Sys-
tem).
G WARNING
The airbags or belt tensioners may either be triggered uninten-
tionally or, in the event of an accident, may not be triggered.
This poses an increased risk of injury.
X Drive on carefully.
X Have SRS checked at aqualified specialist workshop immedi-
ately.
For further information about the Supplemental Restraint System,
see (Y page 41). Engine
Problem Possible causes/consequences and
M Solutions
;
The yellowe
ngine diag-
nosticsw arning lamp
lights up while the
engine is running. There may be
afault, for example:
R in the engine management
R in the fuel injection system
R in the exhaust system
R in the ignition system (for vehicles with petrol engines)
R in the fuel system
The emission limit values may be exceeded and the engine may
be running in emergency mode.
X Have the vehicle checked as soon as possible at aqualified
specialist workshop. Vehicles with
adiesel engine: the fuel tank has been run dry
(Y page 158).
X Start the engine three to four times after refuelling.
If the yellow engine diagnostics warning lamp goes out, emer-
gency running mode is cancelled. The vehicle need not be
checked. 266
Warning and indicator lampsint
he instrument clusterOn-board computer and displays

Problem Possible causes/consequences and
M Solutions
8
The yellowr
eserve fuel
warning lamp lights up
while the engine is run-
ning. The fuel level has dropped into the reserve range.
Operation of the auxiliary heating is deactivated if the fuel level
drops into the reserve range.
X
Refuel at the nearest filling station. ?
The red coolant warn-
ing lamp lights up while
the engine is running
and the coolant tem-
perature gauge is at the
start of the scale.
The temperature sensor for the coolant temperature gauge is
faulty.
The coolant temperature is no longer being monitored. There is a
risk of engine damage if the coolant temperature is too high.
X Stop the vehicle immediately, paying attention to road and traf-
fic conditions, and switch off the engine. Do not continue driving
under any circumstances.
X Secure the vehicle against rolling away (Y page 159).
X Consult aqualified specialist workshop. Warning and indicator lampsint
he instrument cluster
267On-board computer and displays Z